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Prep .c files for removing the #includes from */archdep.h
 * replace #include "archdep.h" with #includes of what is used, pulling in
   "syscall.h", "util.h", and "archdep.h" as needed
 * delete #include <sys/syscall.h> from syscall.h
 * only pull in <sys/stat.h> to the three files that use _dl_fstat(),
   forward declare struct stat in syscall.h for the others
 * NBBY is for <sys/select.h> macros; just use '8' in dl_printf.c
 * <machine/vmparam.h> is only needed on i386; conditionalize it
 * stop using __LDPGSZ: use _MAX_PAGE_SHIFT (already used by malloc.c)
   where necessary
 * delete other bogus #includes, order legit per style: <sys/*> then
   <*/*>, then <*>, then "*"

dir.c improvement from jsg@
ok and testing assistance deraadt@

/*	$OpenBSD: dl_uname.c,v 1.4 2022/01/08 06:49:41 guenther Exp $ */
/*
 * Copyright (c) 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/utsname.h>

#include "syscall.h"
#include "util.h"

/*
 * This file was copied from libc/gen/uname.c and modified for ld.so's
 * syscall method which returns -errno. Also KERN_OSVERSION is not retrieved
 * since ld.so doesn't need it.
 */

int
_dl_uname(struct utsname *name)
{
	const int otmib[2] = { CTL_KERN, KERN_OSTYPE };
	const int ormib[2] = { CTL_KERN, KERN_OSRELEASE };
	const int hmmib[2] = { CTL_HW, HW_MACHINE };
	int rval;
	size_t len;

	rval = 0;

	len = sizeof(name->sysname);
	if (_dl_sysctl(otmib, 2, &name->sysname, &len, NULL, 0) < 0)
		rval = -1;

	len = sizeof(name->release);
	if (_dl_sysctl(ormib, 2, &name->release, &len, NULL, 0) < 0)
		rval = -1;

	len = sizeof(name->machine);
	if (_dl_sysctl(hmmib, 2, &name->machine, &len, NULL, 0) < 0)
		rval = -1;
	return (rval);
}